/**
  * The AIM server doesn't like it if we change states too often and we use this method to slow
  * things down.
  */
 private void pauseBetweenStateChanges() {
   try {
     Thread.sleep(5000);
   } catch (InterruptedException ex) {
     logger.debug("Pausing between state changes was interrupted", ex);
   }
 }
  /**
   * Creates a SSH Session with a remote machine and tries to login according to the details
   * specified by Contact An appropriate message is shown to the end user in case the login fails
   *
   * @param sshContact ID of SSH Contact
   * @throws JSchException if a JSch is unable to create a SSH Session with the remote machine
   * @throws InterruptedException if the thread is interrupted before session connected or is timed
   *     out
   * @throws OperationFailedException if not of above reasons :-)
   */
  public void createSSHSessionAndLogin(ContactSSH sshContact)
      throws JSchException, OperationFailedException, InterruptedException {
    logger.info("Creating a new SSH Session to " + sshContact.getHostName());

    // creating a new JSch Stack identifier for contact
    JSch jsch = new JSch();

    String knownHosts = (String) accountID.getAccountProperties().get("KNOWN_HOSTS_FILE");

    if (!knownHosts.equals("Optional")) jsch.setKnownHosts(knownHosts);

    String identitiyKey = (String) accountID.getAccountProperties().get("IDENTITY_FILE");

    String userName = sshContact.getUserName();

    // use the name of system user if the contact has not supplied SSH
    // details
    if (userName.equals("")) userName = System.getProperty("user.name");

    if (!identitiyKey.equals("Optional")) jsch.addIdentity(identitiyKey);

    // creating a new session for the contact
    Session session =
        jsch.getSession(
            userName, sshContact.getHostName(), sshContact.getSSHConfigurationForm().getPort());

    /**
     * Creating and associating User Info with the session User Info passes authentication from
     * sshContact to SSH Stack
     */
    SSHUserInfo sshUserInfo = new SSHUserInfo(sshContact);

    session.setUserInfo(sshUserInfo);

    /** initializing the session */
    session.connect(connectionTimeout);

    int count = 0;

    // wait for session to get connected
    while (!session.isConnected() && count <= 30000) {
      Thread.sleep(1000);
      count += 1000;
      logger.trace("SSH:" + sshContact.getHostName() + ": Sleep zzz .. ");
    }

    // if timeout have exceeded
    if (count > 30000) {
      sshContact.setSSHSession(null);
      JOptionPane.showMessageDialog(
          null, "SSH Connection attempt to " + sshContact.getHostName() + " timed out");

      // error codes are not defined yet
      throw new OperationFailedException(
          "SSH Connection attempt to " + sshContact.getHostName() + " timed out", 2);
    }

    sshContact.setJSch(jsch);
    sshContact.setSSHSession(session);

    logger.info("A new SSH Session to " + sshContact.getHostName() + " Created");
  }
    /** Thread entry point. */
    @Override
    public void run() {
      int status;
      long progress;
      String statusReason = "";

      while (true) {
        try {
          Thread.sleep(10);

          status = parseJabberStatus(jabberTransfer.getStatus());
          progress = fileTransfer.getTransferedBytes();

          if (status == FileTransferStatusChangeEvent.FAILED
              || status == FileTransferStatusChangeEvent.COMPLETED
              || status == FileTransferStatusChangeEvent.CANCELED
              || status == FileTransferStatusChangeEvent.REFUSED) {
            if (fileTransfer instanceof OutgoingFileTransferJabberImpl) {
              ((OutgoingFileTransferJabberImpl) fileTransfer).removeThumbnailRequestListener();
            }

            // sometimes a filetransfer can be preparing
            // and than completed :
            // transfered in one iteration of current thread
            // so it won't go through intermediate state - inProgress
            // make sure this won't happen
            if (status == FileTransferStatusChangeEvent.COMPLETED
                && fileTransfer.getStatus() == FileTransferStatusChangeEvent.PREPARING) {
              fileTransfer.fireStatusChangeEvent(
                  FileTransferStatusChangeEvent.IN_PROGRESS, "Status changed");
              fileTransfer.fireProgressChangeEvent(System.currentTimeMillis(), progress);
            }

            break;
          }

          fileTransfer.fireStatusChangeEvent(status, "Status changed");
          fileTransfer.fireProgressChangeEvent(System.currentTimeMillis(), progress);
        } catch (InterruptedException e) {
          if (logger.isDebugEnabled()) logger.debug("Unable to sleep thread.", e);
        }
      }

      if (jabberTransfer.getError() != null) {
        logger.error(
            "An error occured while transfering file: " + jabberTransfer.getError().getMessage());
      }

      if (jabberTransfer.getException() != null) {
        logger.error(
            "An exception occured while transfering file: ", jabberTransfer.getException());

        if (jabberTransfer.getException() instanceof XMPPException) {
          XMPPError error = ((XMPPException) jabberTransfer.getException()).getXMPPError();
          if (error != null)
            if (error.getCode() == 406 || error.getCode() == 403)
              status = FileTransferStatusChangeEvent.REFUSED;
        }

        statusReason = jabberTransfer.getException().getMessage();
      }

      if (initialFileSize > 0
          && status == FileTransferStatusChangeEvent.COMPLETED
          && fileTransfer.getTransferedBytes() < initialFileSize) {
        status = FileTransferStatusChangeEvent.CANCELED;
      }

      fileTransfer.fireStatusChangeEvent(status, statusReason);
      fileTransfer.fireProgressChangeEvent(System.currentTimeMillis(), progress);
    }